Chemical heater.



A. L. RADLBIN al J. W'.' MURPHY. CHEMICAL HEATER.

APPLICATION FILED SEPT. 23,1912.

1,088,926. Patented Mar. 3, 1914.l

O OOOOOOOOOOO OOOOOOOOOOOOOOOO ALBERT L. RADLEIN AND JAMES W. MURPHY, orcH1cAGo,.ILL1No1Vs.

l CHEMICAL HEATER.

Specication of Letters Patent.

Patented Mar. 3, 1914.

Application filed September 23, 1912. Serial No. 721,861.

i To all whom it may concern:

Be it known that we, ALBERT L. RADLEIN and JAMES W. MURPHY, citizens ofthe 'United States of America, and residents of Chicago, in the countyof Cook, State of Illinois, have invented certain new` and usefulImprovements in Chemical Heaters, of which the following is aspecification.

This invention relates to that class of chemical heatin compositionsused in foot warmers and li e heating appliances, and whichare adaptedto generate a constant and long continued heat by a correspondingchemical reaction between the component elements of the composition. Andthe present improvement has for its object to provide a cheap andefficient heat generating composition adapted to afford the requiredconstant and long continued heating effect, without liability to rapidchemical reaction and the consequent production of a high and injurioustemperature in actual use, all as will hereinafter more fully appear.

In the accompanying drawing: Figure 1, is a transverse section on lineca -w, Fig. 2, illustrating the lapplication of the present invention toa foot warmer for motor vehicles and the like. Fig. 2, is a plan viewpartly in section on line -m, Fig. 1.

Similar reference numerals indicate like parts in both views.

The present heat generating composition comprises4 a dry mixture of ironin a comminuted state, preferably in the form of iron borings, andordinary sal-ammoniac or chlorid ofv ammonium, in the 'proportions offive pounds of iron borings to one ounce of sal-ammoniac. Saidproportions, however, may be varied in accordance with the practicalrequirement of a more or less rapid chemical action and a correspondingrapidity in the production of heat.

In actual use the heating action of the composition will be started bytherapplication of moisture in any usual and suitable manner, andpreferably by the special means hereinafter described, and suchheatingaction is due to the rapid oxidation of the iron particles under thecombined influence of moisture and the sal-ammoniac of the composition.

In the preferred form of the present invention the above describedcomposition will be inclosed in a bag or housing of iexible andabsorbent material that is adapted to hold the required amount ofmoisture, when water is applied thereto. By a kneading action on saidbag or housing and its contents, the moisture is brought into contactwith the inclosed materials to start the chemical reaction and heatgeneration above described and which when started will continue unt themoisture is exhausted by long continued operation.

In the accompanying drawings, 1 represents the'bag or housing abovedescribed, and 2. the filling of the chemical heat generatingcomposition.

3 is a protecting casing of metal or like material, in which the filledbag or housing 1 above described is disposed to form a foot warmer orlike appliance. Said casingis preferably of an oblong box form, havingrounded sides and provided with a hinged cover 4, affording access tothe interior of the casing.

5 is a perforated partition, arranged horizontally within the casing 3,and adapted to provide a support for the bag or housing 1 in positionfree from contact with the top, bottom, side and end. walls of thecasing 3, and so that the atmospheric air may freely circulate aroundall parts of the said bag or housing 1, to carry oi' the heat asgenerated.

6 are a series of oricesformed in the end wallsfof the casing 3 for theescape of the heated air.

In the preferred form of the casing 3f 5 mass of iron in a comminutedstate and chlorid of ammonium, and a housing of Water absorbent materialinclosing said mass,

substantially as set forth.

2. A chemical heater, comprising a mixed 10 mass of iron in a comminutedstate and chlorid of ammonium, and a housing of fiexible Water absorbentmaterial inclosing said mass, substantially as set forth.

Signed at Chicago, Illinois, this 21st day of September, 1912.

ALBERT L. RADLEIN. JAMES W. MURPHY. Witnesses:

ROBERT BURNS, IVA L. CRANE.

